Try the MP3 conversion with a MIDI test file

MIDI, MIDI files
(.midi)

The MIDI file format was developed to ease the transfer of MIDI data between applications for musicians and audio developers. Cues, volume, pitch, velocity, and other notations information are carried withing the MIDI file. These messages contained in the file help to synchronize the tempo between multiple devices. Next to enabling the user to play multiple audio channels from only one...What is MIDI

MP3, MPEG Layer 3 Audio
(.mp3)

A MPEG-1 or MPEG-2 Audio Layer III files (file extension name: MP3) is the standard audio storage file type. Most music players (and smart phones) play music using MP3 files. The lossy compression reduces the quality without straying tremendously from the original, uncompressed recording. This is done by removing those sounds the human ear is incapable of hearing and processing. MP3 files are...What is MP3